Self-gravity of debris discs can strongly change the outcomes of interactions with inclined planets

ABSTRACT Drastic changes in protoplanets’ orbits could occur in the early stages of planetary systems through interactions with other planets and their surrounding protoplanetary or debris discs. The resulting planetary system could exhibit orbits with moderate to high eccentricities and/or inclinat...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2023-09, Vol.526 (2), p.2017-2031
Hauptverfasser: Poblete, Pedro P, Löhne, Torsten, Pearce, Tim D, Sefilian, Antranik A
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container_end_page 2031
container_issue 2
container_start_page 2017
container_title Monthly notices of the Royal Astronomical Society
container_volume 526
creator Poblete, Pedro P
Löhne, Torsten
Pearce, Tim D
Sefilian, Antranik A
description ABSTRACT Drastic changes in protoplanets’ orbits could occur in the early stages of planetary systems through interactions with other planets and their surrounding protoplanetary or debris discs. The resulting planetary system could exhibit orbits with moderate to high eccentricities and/or inclinations, causing planets to perturb one another as well as the disc significantly. The present work studies the evolution of systems composed of an initially inclined planet and a debris disc. We perform N-body simulations of a narrow, self-gravitating debris disc, and a single interior Neptune-like planet. We simulate systems with various initial planetary inclinations, from coplanar to polar configurations considering different separations between the planet and the disc. We find that except when the planet is initially on a polar orbit, the planet–disc system tends to reach a quasi-coplanar configuration with low vertical dispersion in the disc. When present, the Zeipel–Kozai–Lidov oscillations induced by the disc pump the planet’s eccentricity and, in turn, affect the disc structure. We also find that the resulting disc morphology in most of the simulations looks very similar in both radial and vertical directions once the simulations are converged. This contrasts strongly with massless disc simulations, where vertical disc dispersion is set by the initial disc-planet inclination and can be high for initially highly inclined planets. The results suggest caution in interpreting an unseen planet’s dynamical history based only on the disc’s appearance.
doi_str_mv 10.1093/mnras/stad2827
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title Self-gravity of debris discs can strongly change the outcomes of interactions with inclined planets
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